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STEP 7 (TIA Portal): Process control loop compact Towards Management Force Level

Hi 
I am using  S7 1200  PLC . I want to use pid compact to control pressure trough manupulating the speed of motor using ACS850 vfd. The pressure sensor  input range is -10 to 5mbar as a 4-20mA
receive pressure value nearest 0 to -3mbar,so i use setpoint is -1.16mbar,
i have tried  pretunning but i obtain the error process value is close to setpoint,
For successive pretunning formula,
sp-pv >0.3 (high pv-low pv)
according to this formula pretuning is not possible,
if possible then anyboady help us
 
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